Had a bad accident with my TT21 today. - diyAudio
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Old 18th March 2005, 05:39 PM   #1
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Default Had a bad accident with my TT21 today.

Hi there,
Whilst working up the case for my new paraffed amp I accidently dropped one of my precious TT21's, it landed on its top cap, which now wiggles with a slight grating sound. The vacume is compromised as there is a slowly creeping white developing from the top cap. End result dead TT21.

These are a bastard to get hold of, even if you can afford them. Any one got a single spare which they want to sell. If not I might have to consider redesigning the circuit to use something a little more affordable.

Shoog
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Old 18th March 2005, 05:50 PM   #2
Giaime is offline Giaime  Italy
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Nooo! I am crying for you.... Good luck!
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Old 18th March 2005, 06:32 PM   #3
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Aww
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Old 18th March 2005, 11:49 PM   #4
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Replace it with a KT88 and rewire the base.
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Old 19th March 2005, 12:07 AM   #5
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I was thinking of that. The only draw back is that the KT88 isn't rated for as high dissapation so it wont last quite as long.
I was hoping that the TT21's would nearly never need replacing because I was running them so lightly.

Shoog
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Old 19th March 2005, 12:37 AM   #6
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What was a TT21? Never heard of it. Whatever it is you probably just doubled the value of the remaining one. It is very risky designing equipment around only one-of's no matter how rad the sought after outcome, but I guess you know this now.
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Old 19th March 2005, 02:35 AM   #7
anatech is offline anatech  Canada
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Still, we mourn it's passing and resultant cost to the owner. Time for a beer.

-Chris
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Old 19th March 2005, 06:03 AM   #8
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poor shoog... and just the day after st patties

it is always sad to see a bottle die -- especially one as scarce as that

dave
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Old 19th March 2005, 06:45 AM   #9
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Quote:
Originally posted by rcavictim
What was a TT21?
A KT88 with a top cap. The internal construction should be identical.

You used to be able to buy them from Retrovox, but they're out of stock
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Old 19th March 2005, 08:05 AM   #10
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Thanks all for the sympathy.
The reason I was designing around the TT21 was because the transmitter I junked to make my amp had two in it. Hence before this tradgedy the tubes were for free. The actual sonics of the tube are relatively immaterial in its application as a CCS.
Dave I was going to get in touch with your good self in order to check if you had any squirelled away - appears not !
I will probe the Radio Ham field to see if anything turns up.

Shoog
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